Page 24 - Volume 15 Number 3
P. 24

Prop Sync Squawk?
TROUBLESHOOTING TEST INSTRUMENTS
• Confirm proper system operation • Quickly identify faulty LRU’s
• Multiple aircraft applications
Prop Sync S S o o o l u t i o o o n n s Phone: 815-230-0300 Fax: 815-230-0332 Mobile: 815-298-7017
www propsyncsolutions com
common to discover that one of the dual fed buses is receiving power from only one of its feeds Once I even found an an airplane in which the No No 1 and No No 2 dual fed buses had been bridged together! All four feeder CBs were applying power to both buses Although the wiring should be checked during some of the maintenance checks it is such an an easy thing to do that I encourage you pilots to conduct the checks yourself occasionally Here’s how: Find the two 50-amp CBs for dual fed bus No 1 on on the the right sidewall Turn on on the the airplane’s battery then pull one of the the two CBs let’s say the the right one Nothing should happen This verifies that the the other feeder CB – the left one that isn’t pulled yet – is is indeed providing power to the bus Now also pull the left feeder CB By doing this the bus should “die ” You may notice the left oil temperature and pressure gauge drop to zero but why did the avionics just come on?! Because the avionics master CB gets power from the No 1 fuel fed bus – – the one that just died – – and the avionics power relays are the the normally closed type not the the more common normally open type (I am sure you have been taught that pulling the avionics master CB is equivalent to turning ON the avionics master switch Right? If the switch ever shorts out internally causing the avionics to die this is is the “workaround” fix )
By noting that the No 1 dual fed bus did not fail when we pulled the first (right) feeder CB we know that the the left CB is able to power the the bus But for all we know the right CB was dead at at the start To verify that is not the the case – that the the bus is truly dual fed – reset the right CB first and make sure the bus again receives power See how easy it is to check that the dual fed bus indeed has its two sources? So now continue doing this for the remaining No 2 dual fed bus on the right sidewall as as well as as dual fed fuses No 3 and No 4 on the left sidewall The fuel gauges are the easiest way to tell if the No No 3 or No No 4 dual fed buses is or is not receiving power Looking for a Cost Effective Solution?
We understand reducing costs costs associated with wheels brakes and and brake brake hoses is an an an an essential part of controlling your maintenance costs costs We’re here for you Ask us about:
• Our comprehensive wheel brake brake and brake hose inventory
• FAA-PMA parts and overhaul capabilities
• Repair overhaul and exchange services
• On-the-shelf exchange programs • Quick turn time • Hot pacs
• Flat rate exchange You need it it We have it it Ask us how you can save today 404 767 0282 | proaviation com/brakes
22 • KING AIR MAGAZINE
MARCH 2021



















































































   22   23   24   25   26